<<His feet lift into the air just as the ground gives way to sky. Within minutes, he’s high above Fewa Lake. The box on his chest issues commands, which Popa hears through headphones. “Weight shift,” the gadget tells him. “Brake left,” and then, “Brake more.” Popa manipulates the control handles, and the wing spins around him, building momentum. At exactly the right moment, Popa’s electronic tutor directs him to flick it overhead, somersaulting his body neatly over it with enough speed to keep the catapult going for several revolutions.>>